package com.jk.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {
	
	  public static String getIpAddr(HttpServletRequest request){  
          String ipAddress = request.getHeader("x-forwarded-for");  
              if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                  ipAddress = request.getHeader("Proxy-Client-IP");  
              }  
              if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                  ipAddress = request.getHeader("WL-Proxy-Client-IP");  
              }  
              if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                  ipAddress = request.getRemoteAddr();  
                  if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                      //根据网卡取本机配置的IP  
                      InetAddress inet=null;  
                      try {  
                          inet = InetAddress.getLocalHost();  
                      } catch (UnknownHostException e) {  
                          e.printStackTrace();  
                      }  
                      ipAddress= inet.getHostAddress();  
                  }  
              }  
              //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
              if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
                  if(ipAddress.indexOf(",")>0){  
                      ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
                  }  
              }  
              return ipAddress;   
      }  
}
